超声波体外充电的实验研究

目的探讨以超声波作为能量载体实现对心脏起搏器电池进行体外无创充电的可行性及有效性。方法采用超声波作为能量载体，通过压电陶瓷、耦合匹配、后级整理等电路进行能量的无线发送与接收，并加入磁耦合等补偿电路，提高超声波的能量传输效率。以水和成年猪的肌肉组织为不同的传输介质，超声波充电后产生的电压和电流作对比研究。结果超声波发生器在体外充电过程中的实际工作参数为：P=10．0W，f=（60—70）KHz。连接不同的阻抗负载电阻的三套电路。在负载小于100KΩ时，充电电路的输出电流随负载的降低而变化不大，输出电压随负载降低而降低；在负载大于1MQ时．充电电路的输出电压随负载的增大而变化不大，输出电流随负载增大而降低；在负载于（100KΩ－1MΩ）范围内，充电电路输出功率处于最高的范围，在（0．5—1）mw范围内，随负载的增大而变化不大。结论通过超声波发生器在体外通过肌肉组织对起搏器电路进行无创式充电是可行的。

Experimental Study on Ultrasound in Vitro Charge

Objective To explore the feasibility and effectiveness of the ultrasound, as an energy carrier, in achieving non-invasive battery charging of cardiac pacemakers. Methods The ultrasound was used as an energy carrier, sending and receiving energy wirelessly through circuit such as the piezoelectric ceramics, coupling matching, etc., and meanwhile adding compensating circuit like magnetic cou- pling to enhance the transmission efficiency of ultrasonic energy. Pure distilled water and older pigs＇ muscular tissue were practiced as two different transmission medium, the voltages and currents after charging the ultrasonic were comparatively studied. Results During the in vit- ro charging process of ultrasonic generator the actual operating limits were： P =10.0 W, f= （60 - 70） KHz. Three sets of circuits, connecting different impedance load resistance. When the load was less than 100 KΩ, the output current of the charging circuit changed little with the decrease of the load and the output voltage was reduced as the load decreases; when the load was more than 1 MΩ, the output voltage of the charging circuit changed little with the increase of the load and the output current was reduced as the load increases; when the load was be- tween 100 KΩ to 1 MΩ, the output power of the charging circuit was at the highest range and it had little changes with the increase of the load when the load was between 0.5 mW to 1 mW. Conclusion It is feasible to charge the circuit of pacemakers in a non-invasive way through the muscle tissue by the ultrasonic generator in vitro.